This is a name given to a person who is Extremely "PIKEY" or "SCUM" in nature and also suffers from a terrible twitch which could cause them to throw money all over the village shop or Inadvertently entertain school children on a bus.

"Wahey look at Twitchard go she's gonna smack someone with that hand in a minute!" or "Hey look over there, it's Richard and Twitchard!"